Just selective competitive keywords as your major keywords. Use them in your forum's sigs, article resource box, anchor text in web directories, text link in your link exchange partner sites....
I like the design of your site. It's very clean, neat and attractive. Just try to target more keywords to make your site more search-engine friendly...
Just continue in link building. Try to use your targeted keyword in your forum sig and article resource box.. This will help you to increase the keyword ranking of your site..
On page optimization includes selecting competitive keywords in your title, meta tags and anchor text. You can also put keywords in your alt tags. You can also highlight your important keywords by making them bold or italic..